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Q.

A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is held stationary inside the coil


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a

No current is generated

b

No deflection

c

Current is produced

d

None of the above 

answer is A.

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Detailed Solution

Concept- If a bar magnet is  pushed into the coil, If a bar magnet is  withdrawn from inside the coil, If a bar magnet is  held stationary inside the coil.
Because there is no associated battery in the loop, the current created in the insulated copper wire induces current. The magnetic field across the coil will be altered as a result. As a result, a current may be created in the coil.
A galvanometer is attached to a coil of insulated copper wire.
When a magnet is driven into a coil, the galvanometer attempts to deflect in that direction, and an electromotive force is created in the coil according to Faraday's rule. As the magnet moves near a bar magnet, electromagnetic induction causes electricity to flow.
If a bar magnet is  removed from within the coil
The current is created in the coil once more as the bar magnet is withdrawn from within the shielded copper wire coil, but this time in the other direction. When the magnet is withdrawn, the galvanometer attempts to deflect in the other direction.
If a bar magnet is held stationary inside the coil.
Because no current is generated when a bar magnet is held stationary within the coil, the galvanometer shows no deflection.
Hence, the correct option is 1.
 
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